Use this oenology calculation to document or plan a defined fermentation, blending, adjustment, stabilization, aging, packaging, sensory, or cellar operation from measured wine parameters.

PP index

Polymeric pigment index measured by the bisulfite bleaching assay.

Stability threshold

Index at or above which the color is considered polymerized and stable.

Compare a polymeric-pigment assay result with a caller-selected threshold; crossing the threshold does not by itself establish long-term color stability. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Meets threshold

Whether the index is at or above the supplied threshold.

• Wine chemistry and microbiology depend on temperature, pH, alcohol, sugar, matrix, measurement method, microbial state, legal limits, product formulation, and bench-trial response. Generic doses and thresholds are not production instructions for every wine.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm measurements with calibrated winery methods, run scaled bench trials, record additions and lot volumes, check local regulations and supplier specifications, and obtain professional laboratory advice for faults or stability risks.

• CMC Stability Dose Calculator

  Convert a product specification or treatment-plan carboxymethylcellulose rate into total grams for the selected wine volume; it does not determine tartrate stability or select a dose.

• Fructose-Glucose Ratio Checker

  Calculate the fructose-to-glucose ratio and compare it with caller-selected watch and fructose-dominant thresholds; the ratio alone does not diagnose a stuck fermentation.

• Fermentation Heat Exposure Degree-Hours Calculator

  Calculate temperature-exposure degree-hours above a caller-selected critical temperature; the index quantifies exposure but does not independently predict yeast injury.